X-Git-Url: http://www.git.cypherpunks.ru/?p=gogost.git;a=blobdiff_plain;f=gost3410%2Fprivate.go;fp=gost3410%2Fprivate.go;h=be10c1f394905cc4858c25fd2f08015e5e4de756;hp=18549a29cf1f0f8718af45fef3059ba0183c7977;hb=b7f69d1826caacffd042ca8660aba41d0945de0f;hpb=e077d5f903e233fbefed0815be21be5f8f482017

diff --git a/gost3410/private.go b/gost3410/private.go
index 18549a2..be10c1f 100644
--- a/gost3410/private.go
+++ b/gost3410/private.go
@@ -139,8 +139,11 @@ Retry:
 	), nil
 }
 
-// Sign the digest. opts argument is unused.
-func (prv *PrivateKey) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
+// Sign the digest. opts argument is unused. That is identical to SignDigest,
+// but kept to be friendly to crypto.Signer.
+func (prv *PrivateKey) Sign(
+	rand io.Reader, digest []byte, opts crypto.SignerOpts,
+) ([]byte, error) {
 	return prv.SignDigest(digest, rand)
 }
 
@@ -160,11 +163,14 @@ func (prv *PrivateKeyReverseDigest) Public() crypto.PublicKey {
 	return prv.Prv.Public()
 }
 
-func (prv *PrivateKeyReverseDigest) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
-	d := make([]byte, len(digest))
-	copy(d, digest)
-	reverse(d)
-	return prv.Prv.Sign(rand, d, opts)
+func (prv *PrivateKeyReverseDigest) Sign(
+	rand io.Reader, digest []byte, opts crypto.SignerOpts,
+) ([]byte, error) {
+	dgst := make([]byte, len(digest))
+	for i := 0; i < len(digest); i++ {
+		dgst[i] = digest[len(digest)-i-1]
+	}
+	return prv.Prv.Sign(rand, dgst, opts)
 }
 
 type PrivateKeyReverseDigestAndSignature struct {
@@ -175,11 +181,14 @@ func (prv *PrivateKeyReverseDigestAndSignature) Public() crypto.PublicKey {
 	return prv.Prv.Public()
 }
 
-func (prv *PrivateKeyReverseDigestAndSignature) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
-	d := make([]byte, len(digest))
-	copy(d, digest)
-	reverse(d)
-	sign, err := prv.Prv.Sign(rand, d, opts)
+func (prv *PrivateKeyReverseDigestAndSignature) Sign(
+	rand io.Reader, digest []byte, opts crypto.SignerOpts,
+) ([]byte, error) {
+	dgst := make([]byte, len(digest))
+	for i := 0; i < len(digest); i++ {
+		dgst[i] = digest[len(digest)-i-1]
+	}
+	sign, err := prv.Prv.Sign(rand, dgst, opts)
 	if err != nil {
 		return sign, err
 	}